Binary black holes gone MAD: Magnetically arrested minidisks around nonspinning black holes
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866918223462531072 |
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| author | Manikantan, Vikram Paschalidis, Vasileios |
| author_facet | Manikantan, Vikram Paschalidis, Vasileios |
| contents | We demonstrate the formation of magnetically arrested minidisks (MAM) around equal-mass, nonspinning binary black holes with magnetohydrodynamic simulations of circumbinary disk accretion in full 3+1 general relativity. The initial separation of $d\sim 30\,M$ allows the black holes to host large minidisks that suppress the total rest-mass accretion rate variability, which is modulated primarily at $\sim 1.6 \, f_{\rm orb}$. Each black hole horizon saturates with dimensionless magnetic flux $ϕ\sim 30$. Magnetic reconnection near the horizons drives recurrent eruptions which are expected to drive flaring in the infrared and X-ray bands. Our results establish MAMs as a new outcome of circumbinary disk accretion, and a promising source of novel electromagnetic counterparts to gravitational waves from binary black holes. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_18254 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Binary black holes gone MAD: Magnetically arrested minidisks around nonspinning black holes Manikantan, Vikram Paschalidis, Vasileios High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology We demonstrate the formation of magnetically arrested minidisks (MAM) around equal-mass, nonspinning binary black holes with magnetohydrodynamic simulations of circumbinary disk accretion in full 3+1 general relativity. The initial separation of $d\sim 30\,M$ allows the black holes to host large minidisks that suppress the total rest-mass accretion rate variability, which is modulated primarily at $\sim 1.6 \, f_{\rm orb}$. Each black hole horizon saturates with dimensionless magnetic flux $ϕ\sim 30$. Magnetic reconnection near the horizons drives recurrent eruptions which are expected to drive flaring in the infrared and X-ray bands. Our results establish MAMs as a new outcome of circumbinary disk accretion, and a promising source of novel electromagnetic counterparts to gravitational waves from binary black holes. |
| title | Binary black holes gone MAD: Magnetically arrested minidisks around nonspinning black holes |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2509.18254 |